I'm curious, what principles do the sensors in these smartwatches (like PPG, ECG, motion tracking, etc.) use to collect data? For example, how is heart rate measured? What are the differences between MRN detector and optical sensor versions? What algorithms are involved in data processing?
How do the sensor mechanisms in smart wristbands work?
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Thanks, it'll be a useful discussion. So, which brands do you find have the most reliable sensor technology?